Expansion coupling for plastic pipe



FIG. 1 is a perspective view taken from one side of an expansion coupling for plastic pipe showing my new design;

FIG. 2 is an elevational view taken from the side opposite that shown in FIG. 1;

FIG. 3 is an elevational view taken from one end thereof; and

FIG. 4 is an elevational view taken from the end opposite that shown in FIG. 3. 

The ornamental design for an expansion coupling for plastic pipe, substantially as shown and described. 